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用作制动的摩擦材料,在制动时把飞轮的动能在几秒钟内转变为热能。热能一部份散发掉,其余则引起摩擦材料和对偶的升温:在一般场合下可达300～400℃,特殊场合下甚至可达1000℃,根据盘式制动器摩擦面温度的计算方法,可算出通常操作温度是300℃,表面升温是摩擦材料在工作过程中发生的主要物理现象。摩擦材料是石棉、树脂、橡胶和无机填料等组成的复合材料。升温必然引起这些组份发生一系列化学和物理变化,并会反映到材料的摩擦性能上来,这就是摩擦材料的热影响。摩擦材料的热影响主要表现在二个方面(图1),一是高温下摩擦系数下降,通常叫“热
Used as a brake friction material, the kinetic energy of the flywheel into a few seconds in the brake into heat. The heat is partially dissipated, while the rest causes the heating of the friction material and the dual: up to 300-400 ° C in normal conditions and even up to 1000 ° C in special situations. Based on the calculation of the friction temperature of the disc brake, Usually operating temperature is 300 ℃, the surface temperature is the friction material in the work of the main physical phenomena occurred. Friction material is asbestos, resin, rubber and inorganic filler composed of composite materials. Heating up will inevitably cause a series of chemical and physical changes in these components, and will reflect the friction properties of the material, which is the thermal effect of friction materials. The thermal effects of friction materials mainly in two aspects (Figure 1), first, the friction coefficient decreases at high temperatures, usually called "hot